A certain parasite causes cryptosporidiosis. It often enters the body through food or drink that has the parasite. It can also be passed from contaminated water, soil, or stool (poop). Common ways are:
Water from lakes, streams, hot tubs, swimming pools, or water parks
A baby's dirty diapers
Touching animals, cleaning cages, or going to barns or petting zoos
Eating food grown in soil
Eating or drinking unpasteurized dairy products or apple cider
The infection is more common in children 2 years of age or less. Other things that raise the risk are:
Being or working in day care or a group setting
Conditions that weaken the immune system such as cancer,
HIV, or an organ transplant
Swimming in or drinking contaminated water
People who have oral to anal contact during sex
Most people do not have symptoms. If symptoms happen, they may cause:
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